Posted by
Geoffrey Mackenzie-Kennedy on
Jan 21, 2008; 3:45pm
URL: http://elecraft.85.s1.nabble.com/Strange-behaviour-in-K2-tp459483p459485.html
VR2BrettGraham <
[hidden email]> wote:
> This
> behavior is due to an environment that apparently the K2
> was not really meant to be used in - one with plenty of
> strong signals about.
Brett,
To be fair to the K2, the design of the variable IF filter and the use of a
MC1350G as IF amplifier and NE602 as product detector does suggest that the
K2 was not designed to cope with very strong unwanted signals close to the
operating frequency, which is the 40m environment above 7100 kHz in *some*
parts of Europe. With 6 or more BC stations spaced 5 kHz and/or 10 kHz
rolling in with carrier levels up in the -10dbm region, > S9 +60db, it is no
wonder that the K2 using these 'weak' devices cannot cope properly if asked
to listen amongst these monsters.
The tuning 'click' problem appears to be caused by layout, lack of shielding
and lack of lead filtering - a separate issue which could have been avoided
IMHO.
> Also
> unfortunate is that it appears that mods developed in EU to
> address these two issues are not sufficient for the
> environment here.
Probably not for Hans LA2MOA in Norway either, nor here in Northern UK.
73,
Geoff
GM4ESD
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